Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, nhung don
hieu lang » chieu sang, hieu quang, nhieu tang
nhan dang » nhan dan, phan dang, tran dang
hang cong » dang cong, hang nong, bang cong
dang cua » dung cua, dong cua, mang cua
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sach) or (hieu lang)) - nhan dang cua ((nhung cong) or (hang cong)) dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (hieu lang)) - nhan dang cua ((nhung cong) OR (hang cong)) dan phan cau.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (hieu lang)) - nhan dang cua ((nhung cong) or (hang cong)) dan phan cau*.